Backtrace

WARNING: CPU: 3 PID: 0 at drivers/net/wireless/intel/iwlwifi/pcie/trans.c:2084 iwl_trans_pcie_grab_nic_access+0x1e9/0x220 [iwlwifi]
Modules linked in: ccm xt_CHECKSUM xt_MASQUERADE nf_nat_tftp nf_conntrack_tftp nf_conntrack_netbios_ns nf_conntrack_broadcast xt_CT ip6t_rpfilter xt_conntrack ebtable_nat ebtable_broute tun bridge stp llc ip6table_nat ip6table_mangle ip6table_raw ip6table_security iptable_nat ip6t_REJECT nf_reject_ipv6 nf_nat iptable_mangle iptable_raw iptable_security nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 libcrc32c ipt_REJECT nf_reject_ipv4 xt_owner ip_set nfnetlink ebtable_filter ebtables ip6table_filter ip6_tables iptable_filter bnep bbswitch(OE) ftdi_sio sunrpc intel_rapl_msr iwlmvm intel_rapl_common btusb mei_hdcp btrtl x86_pkg_temp_thermal mac80211 intel_powerclamp mei_wdt btbcm coretemp btintel kvm_intel bluetooth kvm libarc4 iTCO_wdt iTCO_vendor_support iwlwifi ppdev snd_hda_codec_realtek snd_hda_codec_generic dell_laptop snd_hda_codec_hdmi snd_hda_intel irqbypass ledtrig_audio snd_intel_dspcfg cfg80211 crct10dif_pclmul ecdh_generic dell_smm_hwmon snd_hda_codec ecc crc32_pclmul
 snd_hda_core snd_hwdep snd_seq ghash_clmulni_intel snd_seq_device intel_cstate intel_uncore dell_wmi snd_pcm dell_smbios intel_rapl_perf dcdbas snd_timer pcspkr mei_me wmi_bmof joydev sparse_keymap dell_wmi_descriptor snd i2c_i801 mei lpc_ich soundcore parport_pc parport dell_smo8800 dell_rbtn rfkill ip_tables i915 i2c_algo_bit drm_kms_helper drm mxm_wmi crc32c_intel sdhci_pci cqhci sdhci mmc_core serio_raw e1000e wmi video fuse
CPU: 3 PID: 0 Comm: swapper/3 Tainted: G           OE     5.5.11-200.fc31.x86_64 #1
Hardware name: Dell Inc. Latitude E5440/08RCYC, BIOS A21 02/01/2018
RIP: 0010:iwl_trans_pcie_grab_nic_access+0x1e9/0x220 [iwlwifi]
Code: ed c7 49 8d 56 08 bf 00 20 00 00 e8 81 61 7a c6 e9 36 ff ff ff 89 c6 48 c7 c7 c8 00 98 c0 c6 05 59 4d 03 00 01 e8 99 7e 78 c6 <0f> 0b e9 f1 fe ff ff 48 8b 7d 38 48 c7 c1 30 01 98 c0 31 d2 31 f6
RSP: 0018:ffffb1a4c0130dd0 EFLAGS: 00010086
RAX: 0000000000000000 RBX: ffffb1a4c0130e00 RCX: 0000000000000007
RDX: 0000000000000007 RSI: 0000000000000092 RDI: ffff96ca26b99cc0
RBP: ffff96ca1f470028 R08: 00000000000003d6 R09: 0000000000000003
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000000
R13: ffff96ca1f47976c R14: 00000000ffffffff R15: 000000000000000b
FS:  0000000000000000(0000) GS:ffff96ca26b80000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fbec45d4000 CR3: 00000000ad60a003 CR4: 00000000001606e0
Call Trace:
 <IRQ>
 iwl_read_prph+0x34/0x90 [iwlwifi]
 iwl_trans_pcie_log_scd_error+0x13a/0x210 [iwlwifi]
 iwl_pcie_txq_stuck_timer+0x46/0x70 [iwlwifi]
 ? iwl_pcie_clear_cmd_in_flight+0x60/0x60 [iwlwifi]
 call_timer_fn+0x2d/0x130
 __run_timers.part.0+0x16f/0x260
 ? tick_sched_handle+0x22/0x60
 ? tick_sched_timer+0x38/0x80
 ? tick_sched_do_timer+0x70/0x70
 run_timer_softirq+0x26/0x50
 __do_softirq+0xee/0x2ff
 irq_exit+0xe9/0xf0
 smp_apic_timer_interrupt+0x76/0x130
 apic_timer_interrupt+0xf/0x20
 </IRQ>
RIP: 0010:cpuidle_enter_state+0xc9/0x3e0
Code: e8 5c e1 8e ff 80 7c 24 0f 00 74 17 9c 58 0f 1f 44 00 00 f6 c4 02 0f 85 ea 02 00 00 31 ff e8 6e 35 95 ff fb 66 0f 1f 44 00 00 <45> 85 ed 0f 88 40 02 00 00 49 63 d5 4c 2b 64 24 10 48 8d 04 52 48
RSP: 0018:ffffb1a4c00a3e68 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: ffff96ca26baae00 RBX: ffff96ca26bb5e28 RCX: 000000000000001f
RDX: 0000000000000000 RSI: 000000002f846563 RDI: 0000000000000000
RBP: ffffffff8874eec0 R08: 00000034bb5dd45a R09: 000000000000afc7
R10: 0000000000007f0a R11: ffff96ca26ba9be4 R12: 00000034bb5dd45a
R13: 0000000000000008 R14: 0000000000000008 R15: ffff96ca2517a680
 ? cpuidle_enter_state+0xa4/0x3e0
 cpuidle_enter+0x29/0x40
 do_idle+0x1e4/0x280
 cpu_startup_entry+0x19/0x20
 start_secondary+0x162/0x1b0
 secondary_startup_64+0xb6/0xc0